bug(ios): embedded Keyman engine not loading

[sentry-io]

Sentry Issue: KEYMAN-WEB-M6

TypeError: undefined is not an object (evaluating 'kmw['showKeyboardList'] = menuKeyDown')
  at init (/Users/jahorton/Library/Developer/CoreSimulator/Devices/55DE8FCE-8C08-4889-B803-C4AE32E358D4/data/Containers/Shared/AppGroup/C40B933F-553A-486B-8F52-30A8EC5153C4/keyman/ios-host.js:47:8)

Note that this is the first line in ios-host.js that actually attempts to reference something on the main Keyman Engine for Web object keyman.

[jahorton]

Using the old "Debug + Sentry" configuration for the iOS project, I was able to force this error by changing the filename for the Web engine in keyboard.html to something incorrect. I also relocated the keyman-sentry.js script higher up so that it would load earlier, before the attempt to follow the broken link for the Web engine. This certainly did force the error and gave us a reproduction.

The reproduction:

https://keyman.sentry.io/issues/5464670660/events/5de209735b97434e9601223ccfe278d7/

Note the release entry: [email protected] Clearly a bit outdated, but it's clearly an error from a local, development build. From the same city as our office. It's a repro.

Sadly, it's worth noting that Sentry does not pick up any breadcrumbs whatsoever for us about the failed attempt to load keyman-webview.js. (Or any .jsx variant, as that's how I chose to retool the reference in order to break it.)

[jahorton]

Aside from my artificial "repro", no instances are recorded for 18.0; they're only 17.0.

I'm currently curious if there may be a relationship to #11259 and the other issues I've associated with it. We've seen random keyboard-script failures and model-script failures... so why not random web-engine script failures as well?

Also, it should go without saying that if this error triggers, that'll also present a blank keyboard - this specific case could well underlie #11202.